You can only see the jacket of the other guy.
I don't think it's the guy next to the woman bc he appears to be darker in skin color than the original surveillance images show, not to mention that he appears to be running (White Hat is walking casually), and he's CONSIDERABLY behind white hat in distance, whereas Black Hat in the surveillance footage is a couple steps ahead of White Hat the whole way. Suddenly he'd be 100 yards behind and running in a panic? I don't think so.
All that, plus the guy in this photo has a reddish color on the front of his jacket, which is not visible on Black Hat in the security footage.